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public MyForm()
{
   InitializeComponent();
}

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        public Hauptfenster()
        {
            // Nicht optimal, aber zum Testen ok, Thread Problem muss noch gelöst werden!!!
            CheckForIllegalCrossThreadCalls = false;
            // ---------------------------------------------------------------------------
            InitializeComponent();
            InitializeControlValues();
            EnableControls();
            // When data is recieved through the port, call this method
            comport.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);

            //Calibration form definieren
            FensterCal = new frmCalibration();
            FensterCal.Show();
            FensterCal.Visible = false;
        }

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    public Hauptfenster()
    {
        InitializeComponent();
    }

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this.Controls.Add(...);